US7682535B2 - Method of filling the cavity of a tool - Google Patents

Method of filling the cavity of a tool Download PDF

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Publication number
US7682535B2
US7682535B2 US10/473,521 US47352104A US7682535B2 US 7682535 B2 US7682535 B2 US 7682535B2 US 47352104 A US47352104 A US 47352104A US 7682535 B2 US7682535 B2 US 7682535B2
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Prior art keywords
melt
cavity
temperature
mold
flow path
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US10/473,521
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US20040135277A1 (en
Inventor
Jürgen Frey
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Priamus System Technologies AG
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Priamus System Technologies AG
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Priority claimed from DE10116998A external-priority patent/DE10116998A1/de
Priority claimed from DE2001155162 external-priority patent/DE10155162A1/de
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Assigned to PRIAMUS SYSTEM TECHNOLOGIES AG reassignment PRIAMUS SYSTEM TECHNOLOGIES AG ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: FREY, JURGEN
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/76—Measuring, controlling or regulating
    • B29C45/78—Measuring, controlling or regulating of temperature
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/76—Measuring, controlling or regulating
    • B29C45/77—Measuring, controlling or regulating of velocity or pressure of moulding material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/76—Measuring, controlling or regulating
    • B29C45/77—Measuring, controlling or regulating of velocity or pressure of moulding material
    • B29C2045/776—Measuring, controlling or regulating of velocity or pressure of moulding material determining the switchover point to the holding pressure

Definitions

  • the invention relates to a method for filling a cavity of a mold for producing a molding from a melt, in particular a cavity of an injection-molding machine, in which the melt is introduced into the cavity under pressure and is placed under a holding pressure toward the end or at the end of its flow path.
  • the temperature of the melt is compared with a multiplicity of predetermined temperature values.
  • the cavity in a mold or die is filled with a melt, in particular comprising plastic, metal or a ceramic. This filling operation continues until the cavity has been filled, after which the process is switched over to what is known as the holding-pressure phase, in which in particular shrinkage of the material in the cavity is also compensated for.
  • a fixed changeover from the injection operation to the holding-pressure operation cannot react to process-induced fluctuations, for example in the viscosity, which in turn leads to a considerable fluctuation in the quality of the moldings.
  • EP 0 707 936 A2 or U.S. Pat. No. 5,993,704 describes methods for determining the changeover time when producing an injection molding. These methods are used to automatically determine the time of volumetric filling in the mold cavity.
  • the existing methods are generally based on measuring the internal pressure.
  • the “kink” between the introduction phase and the holding-pressure phase which results automatically, is determined with the aid of artificial intelligence.
  • the pressure differences between two mold internal-pressure sensors are determined and the profile of these differences over the course of time is analyzed.
  • DE 198 03 352 A has disclosed a method for determining the time of a pressure rise in a mold, with the process being switched over from the injection pressure to the holding pressure as a result of the pressure rise.
  • the pressure rise is determined not by means of pressure sensors but rather by means of temperature sensors.
  • the present invention is based on the object of developing a method of the type described above which makes it possible to switch over to the holding-pressure phase in a simple and cost-effective way yet nevertheless with a relatively high level of accuracy.
  • the foregoing object is achieved by the mold wall temperature being determined toward the end of the flow path of the melt and the changeover point to the holding-pressure phase being determined.
  • the novel method is therefore based on measurement of the mold internal wall temperature at the end of the flow path of the melt.
  • a basic consideration in this context is the fact that in theory the changeover should always occur at approx. 97 to 98% of the flow path in order ultimately to achieve the desired 100% on account of the inertia factor.
  • thermocouple When the melt reaches the position of a corresponding thermocouple, there is a sudden increase in the signal which can be used without further intelligence, e.g. as an analog switching signal.
  • thermocouple Since the flow path length is known to the toolmaker in all cases, it is possible to provide a suitable stipulation with regard to the positioning of an inexpensive thermocouple without any difficulty whatsoever.
  • thermocouple In addition to the function of determining the changeover time, the thermocouple can also perform further functions. By way of example, it can be used to control the shrinkage, to effect temperature-dependent cooling time control or to automatically balance the volumetric filling of the cavity.
  • a commercially available system controls the flow of melt to individual injection nozzles with the aid of separate plungers by measuring the pressure in the hot runner.
  • the volumetric filling can be automatically determined for each feed point or for each hot runner nozzle with the aid of a thermocouple at the end of the flow path, and in this way the control operation can be influenced (changeover from filling operation to holding-pressure operation).
  • FIG. 1 diagrammatically depicts mold families
  • FIG. 2 diagrammatically depicts a modular mold system, partially in section
  • FIG. 3 diagrammatically depicts multi-impression molds
  • FIG. 4 diagrammatically depicts a single-impression mold with multiple gates.
  • FIG. 1 shows a mold family with four cavities 1 . 1 to 1 . 4 .
  • Each cavity 1 . 1 to 1 . 4 has a different geometry, depending on the molding desired.
  • a melt is introduced into the cavity 1 . 1 to 1 . 4 through the injection point 2 , with a melt front being denoted by 3 .
  • Each cavity 1 . 1 to 1 . 4 is assigned a thermocouple 4 toward the end of the flow path.
  • This mold family is used to produce a plurality of injection moldings of different dimensions, different volumes and different weights.
  • the advantage is primarily that it is possible to assemble different parts on site.
  • the resulting quality of the injection moldings is left to chance, i.e. a small cavity, such as for example the cavity 1 . 1 and 1 . 2 , would be switched over to pressure control from velocity control much too late, leading to compression during the filling phase, resulting in stresses.
  • a large cavity would be switched over much too early, resulting in the moldings being distorted and in an undefined filling operation.
  • thermocouple 4 at the end of the respective flow path means that it is automatically determined in each cavity 1 . 1 to 1 . 4 when the volumetric filling is reached. At the same time, the measured wall temperatures can also be used for ongoing control of the shrinkage.
  • FIG. 2 shows a mold 5 which comprises two mold inserts 6 . 1 and 6 . 2 .
  • the mold insert 6 . 2 is intended to be exchangeable.
  • thermocouples in each case at the end of the filling operation means that this changeover point is always determined automatically, and consequently there is no need for this optimization step.
  • FIG. 3 shows a multi-impression mold having a multiplicity of cavities 1 , each cavity 1 having its own injection point 2 and its own thermocouple 4 .
  • the aim in the case of a multi-impression mold with a plurality of geometrically identical cavities is to control the melt flow in such a way that all the cavities are filled and switched over simultaneously. If a balancing system of this type is not used, the processor will often want to switch over as a function of a very specific, selectable cavity. In this case too, this changeover can be realized automatically and significantly more easily with the aid of a thermocouple, and the mold wall temperature in turn provides additional information, for example for controlling the shrinkage of the moldings.
  • a single-impression mold with multiple gates as shown in FIG. 4 is generally used to produce very large injection moldings (e.g. bumpers) with long flow paths.
  • the problem in this case is generally not that of finding a single changeover point, but rather of controlling the flow front of the melt with the aid of sensors in the cavity until volumetric filling is achieved in such a way that the hot runner nozzles at each injection point 2 can be controlled in accordance with the programming selected.
  • This principle can be realized using relatively expensive mold internal pressure sensors, but relatively inexpensive thermocouples 4 fulfill the same purpose. If the individual melt flows are individually controlled, as above, the same principle applies in a similar way.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Powder Metallurgy (AREA)
US10/473,521 2001-04-05 2002-04-02 Method of filling the cavity of a tool Expired - Lifetime US7682535B2 (en)

Applications Claiming Priority (7)

Application Number Priority Date Filing Date Title
DE10116998.1 2001-04-05
DE10116998A DE10116998A1 (de) 2001-04-05 2001-04-05 Verfahren zum Füllen der Kavität eines Werkzeuges
DE10116998 2001-04-05
DE2001155162 DE10155162A1 (de) 2001-11-12 2001-11-12 Verfahren zum Füllen der Kavität eines Werkzeuges
DE10155162 2001-11-12
DE10155162.2 2001-11-12
PCT/EP2002/003609 WO2002081177A1 (fr) 2001-04-05 2002-04-02 Procede pour remplir la cavite d'un moule

Publications (2)

Publication Number Publication Date
US20040135277A1 US20040135277A1 (en) 2004-07-15
US7682535B2 true US7682535B2 (en) 2010-03-23

Family

ID=26009013

Family Applications (1)

Application Number Title Priority Date Filing Date
US10/473,521 Expired - Lifetime US7682535B2 (en) 2001-04-05 2002-04-02 Method of filling the cavity of a tool

Country Status (6)

Country Link
US (1) US7682535B2 (fr)
EP (1) EP1381502B1 (fr)
JP (1) JP4278986B2 (fr)
AT (1) ATE288822T1 (fr)
DE (1) DE50202221C5 (fr)
WO (1) WO2002081177A1 (fr)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20120193824A1 (en) * 2011-01-31 2012-08-02 Precision Machinery Research Development Center Method for controlling temperatures in hot runners of multi-cavity injection mold, method for warning, and control system based on those methods
US8715547B2 (en) 2011-02-24 2014-05-06 Mold-Masters (2007) Limited Closed loop control of auxiliary injection unit
US8980146B2 (en) 2013-08-01 2015-03-17 Imflux, Inc. Injection molding machines and methods for accounting for changes in material properties during injection molding runs
US20160158986A1 (en) * 2013-08-09 2016-06-09 Nissan Motor Co. Ltd. Injection control method and injection control system
US9475226B2 (en) 2013-08-01 2016-10-25 Imflux Inc Injection molding machines and methods for accounting for changes in material properties during injection molding runs
US9643351B2 (en) 2013-08-01 2017-05-09 Imflux Inc Injection molding machines and methods for accounting for changes in material properties during injection molding runs
US10259152B2 (en) 2014-12-11 2019-04-16 Otto Männer Innovation GmbH Injection molding apparatus with heated mold cavities

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7182893B2 (en) 2002-10-11 2007-02-27 Mold-Masters Limited Valve gated nozzle having a valve pin with a sensor
WO2003031146A1 (fr) 2001-10-12 2003-04-17 Mold-Masters Limited Tige de soupape a thermocouple
CA2473112C (fr) 2002-01-09 2009-03-17 Mold-Masters Limited Procede et appareil de mesure de la temperature de matiere en fusion dans une cavite de moule
DE102004031546A1 (de) * 2004-06-29 2006-02-09 Priamus System Technologies Ag Verfahren zum Füllen von zumindest einer Kavität
DE102005029705A1 (de) * 2005-06-10 2006-12-14 Priamus System Technologies Ag Verfahren zum Regeln des Spritzgiesprozesses einer Spritzgiessmaschine
US20070169985A1 (en) * 2006-01-24 2007-07-26 Trw Automotive U.S. Llc Rack and pinion steering assembly
US8329075B2 (en) † 2007-09-20 2012-12-11 Priamus System Technologies Ag Method and device for monitoring, documenting, and/or controlling an injection molding machine
WO2011044705A1 (fr) 2009-10-12 2011-04-21 Kistler Holding Ag Procédé de commande ou de réglage d'un processus d'injection
CH702154A1 (de) * 2009-11-11 2011-05-13 Kistler Holding Ag Verfahren zum steuern oder regeln eines einspritzprozesses.
DE102009054915A1 (de) 2009-12-18 2011-06-22 Robert Bosch GmbH, 70469 Spritzgießverfahren zur Herstellung eines Funktionsteils mit einer Aussparung
US8425217B2 (en) * 2009-12-23 2013-04-23 Rodney J. Groleau Method for installing indirect and direct mold pressure, temperature and flow front detection sensors without machining the mold
DE102014114874A1 (de) 2013-11-22 2015-05-28 Christopherus Bader Verfahren zum Regeln der Füllung von zumindest einer Kavität
US11712826B2 (en) 2019-07-09 2023-08-01 Otrajet Inc. Injection molding system and injection molding method

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5008052A (en) * 1987-12-03 1991-04-16 Toshiba Machine Co., Ltd. Mold clamping pressure control method for injection compression molding and injection compression molding machine
DE19803352A1 (de) * 1998-01-29 1999-08-26 Fraunhofer Ges Forschung Verfahren und Vorrichtung zur Ermittlung des Zeitpunkts eines Druckanstiegs in einer Werkzeugform während eines Kunststoff-Spritzgießverfahrens
US6062087A (en) * 1998-09-23 2000-05-16 Itt Manufacturing Enterprises, Inc. Heat and pressure sensor apparatus employing a piston in direct contact with the measured fluid
US6649095B2 (en) * 2000-11-06 2003-11-18 Frederick J. Buja Method and apparatus for controlling a mold melt-flow process using temperature sensors

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JPS61255825A (ja) * 1985-05-08 1986-11-13 Mitsubishi Heavy Ind Ltd 多段射出保持圧の切換方法
JPS63178021A (ja) * 1987-01-19 1988-07-22 Toshiba Mach Co Ltd 射出成形機の制御方法および装置
ATE131436T1 (de) * 1991-10-01 1995-12-15 Mannesmann Ag Verfahren zur trendregelung des umschaltpunktes beim spritzgiessen
DE4140392C2 (de) * 1991-12-07 1997-02-20 Bosch Gmbh Robert Verfahren zur Regelung eines Spritzgießprozesses

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5008052A (en) * 1987-12-03 1991-04-16 Toshiba Machine Co., Ltd. Mold clamping pressure control method for injection compression molding and injection compression molding machine
DE19803352A1 (de) * 1998-01-29 1999-08-26 Fraunhofer Ges Forschung Verfahren und Vorrichtung zur Ermittlung des Zeitpunkts eines Druckanstiegs in einer Werkzeugform während eines Kunststoff-Spritzgießverfahrens
US6062087A (en) * 1998-09-23 2000-05-16 Itt Manufacturing Enterprises, Inc. Heat and pressure sensor apparatus employing a piston in direct contact with the measured fluid
US6649095B2 (en) * 2000-11-06 2003-11-18 Frederick J. Buja Method and apparatus for controlling a mold melt-flow process using temperature sensors

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
Translation of DE 19803352. *

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20120193824A1 (en) * 2011-01-31 2012-08-02 Precision Machinery Research Development Center Method for controlling temperatures in hot runners of multi-cavity injection mold, method for warning, and control system based on those methods
US8377350B2 (en) * 2011-01-31 2013-02-19 Precision Machinery Research Development Center Method for controlling temperatures in hot runners of multi-cavity injection mold, method for warning, and control system based on those methods
US8715547B2 (en) 2011-02-24 2014-05-06 Mold-Masters (2007) Limited Closed loop control of auxiliary injection unit
US8940202B2 (en) 2011-02-24 2015-01-27 Mold-Masters (2007) Limited Closed loop control of auxiliary injection unit
US9186833B2 (en) 2011-02-24 2015-11-17 Mold-Masters (2007) Limited Closed loop control of auxiliary injection unit
US8980146B2 (en) 2013-08-01 2015-03-17 Imflux, Inc. Injection molding machines and methods for accounting for changes in material properties during injection molding runs
US9321206B2 (en) 2013-08-01 2016-04-26 Imflux, Inc. Injection molding machines and methods for accounting for changes in material properties during injection molding runs
US9475226B2 (en) 2013-08-01 2016-10-25 Imflux Inc Injection molding machines and methods for accounting for changes in material properties during injection molding runs
US9481119B2 (en) 2013-08-01 2016-11-01 iMFLUX Inc. Injection molding machines and methods for accounting for changes in material properties during injection molding runs
US9643351B2 (en) 2013-08-01 2017-05-09 Imflux Inc Injection molding machines and methods for accounting for changes in material properties during injection molding runs
US20160158986A1 (en) * 2013-08-09 2016-06-09 Nissan Motor Co. Ltd. Injection control method and injection control system
US10259152B2 (en) 2014-12-11 2019-04-16 Otto Männer Innovation GmbH Injection molding apparatus with heated mold cavities

Also Published As

Publication number Publication date
EP1381502B1 (fr) 2005-02-09
DE50202221C5 (de) 2018-12-27
DE50202221D1 (de) 2005-03-17
EP1381502A1 (fr) 2004-01-21
ATE288822T1 (de) 2005-02-15
JP4278986B2 (ja) 2009-06-17
WO2002081177A1 (fr) 2002-10-17
JP2004529006A (ja) 2004-09-24
US20040135277A1 (en) 2004-07-15

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